Emerson 400276-01 Shield, Command + and Command Output, Command Output Polarity, Signal Path

Installation

Shield

Two shield terminals are provided as a connection point for cable shields. These two terminals are connected internally to the input power ground terminal on the unit. Shields should be connected on one end only, preferably at the 525 PMC.

Command (+) and Command (-) Output

Command (+) and Command (-) is the analog output signal from the 525 PMC to the external drive's velocity command input. This signal can be scalable from +/-5 volts = maximum velocity to +/-12 volts = maximum velocity at a minimum load impedance of 4.7K. The Command (-) signal has a ground reference to the input power ground of the 525 PMC.

NOTE: It is important that the control ground on the amplifier is connected to the input power ground on the 525 PMC.

Command Output Polarity

A positive voltage out of the command output must cause a clockwise rotation of the motor shaft as viewed from the shaft end. The encoder should turn clockwise as viewed from the shaft. This will ensure a positive count within the 525 PMC.

Signal Path

The command (-) output is internally connected to ground within the 525 PMC. Consequently, the (-) input to the external drive must have a ground reference. The figures below show the two most typical connections to an external drive.

Figure 12 Single Ended Input Configuration

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